JPH0416326Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

This invention relates to a push button switch.
In particular, the present invention relates to a push button switch used in a keyboard or the like formed in a key matrix with many keys.

[Conventional technology]

A conventional push button switch 1 of this type is shown in Fig. 1 A, B, and C.
The following will be explained. Figure A is a vertical cross-sectional view of the switch in the open state, Figure B is a vertical cross-sectional view of the switch in the closed state, and Figure C is the relationship between the movable contact and the fixed contact seen from above the conductive rubber (movable contact). FIG.
In the figure, 2 is a substrate, 3 and 4 are fixed contacts, 5 is a non-conductive rubber, 6 is a conductive rubber fixed to the bottom surface of the rubber 5, 7 is a frame that presses and supports the rubber 5, and 8 is a The slider, 9 is a push button fixed to the slider, and 10 is a coil spring disposed between the frame 7 and the push button 9 to urge the push button upward in the drawing.
When the push button 9 of the push button switch in the open state shown in FIG. 1A is pressed downward in the drawing, the slider 8 presses and deforms the rubber 5 as shown in FIG. and the fixed contact 3,
4 are electrically connected through the rubber 6 and are in a closed state. Then, when the pressing force is released, the coil spring returns to the open state as shown in FIG. 1A due to the urging force of the coil spring. A plurality of push button switches 1 are formed using a common board 2 and a frame 7, and printed wiring is provided on the board 2 in order to appropriately select one of the plurality of fixed contacts and electrically conduct the contact. be done.

[Problem that the idea aims to solve]

In the above conventional example, as shown in Fig. 1C, the space between the fixed contacts 3 and 4 is narrow, so the above wiring cannot be done between them, so jumper wires are used when the wiring is to be crossed. was. However, the use of jumper wires has poor workability and is accompanied by difficulty in designing wiring patterns, making it unsuitable for mass production. Therefore, a technical problem arises that must be solved in order to facilitate the design of the wiring pattern without using the jumper wire, and the present invention aims to solve this problem.

[Means to solve the problem]

This invention was proposed to achieve the above-mentioned purpose, and it includes a movable conductive rubber contact facing a fixed contact provided on a board, and a connection between the conductive rubber, the fixed contact, and the wiring. In a push button switch that has a non-conductive rubber interposed between a conductive rubber and a substrate to prevent short circuits, the fixed contacts to be provided on the substrate are spaced in a straight line with three Furthermore, both ends of the conductive rubber are provided with a large downward protrusion, and the protrusions are normally closed with fixed contacts at both ends provided on the substrate, and the center of the conductive rubber is A small protrusion is also provided at the center of the board, and the small protrusion is formed on the fixed contact at the center of the board so that it can be opened and closed by pressing a button, and furthermore, wiring is connected between the fixed contacts at these three points. It is an object of the present invention to provide a push button switch which can be provided and covered by a non-conductive rubber interposed between the conductive rubber and the substrate.

[Effect]

In the present invention, the fixed contacts provided on the board are provided at three points on a straight line with sufficient distance between them, so a pattern can be wired between them.
Since the wiring is covered with non-conductive rubber, there is no chance of mutual shot between the wiring and the fixed or movable contacts. The large protruding parts at both ends of the conductive rubber are always in contact with the fixed contacts at both ends to keep the switch closed, so when a key matrix with multiple keys is formed. For the pattern wiring, any of the fixed contacts at both ends can be arbitrarily selected.Furthermore, as mentioned above, the pattern wiring can be routed between the fixed contacts, making it easy to design the pattern wiring, and jumper wires. becomes unnecessary. In this way, the small protruding portion of the conductive rubber that opens and closes when the push button is pressed comes into contact with the fixed contact at the intermediate portion when the push button is pressed, and is electrically connected to the fixed contacts at both ends, so that the switch is in the closed state. When the pressing force of the push button is released, the small protrusion is separated from the fixed contact, and the switch is placed in an open state.

【Example】

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 2 to 6. In the figure, the same reference numerals are used to refer to the parts shown in FIG. 1. FIGS. 2A, B, C, and D show a first embodiment of the push button switch 11 of the present invention, FIG. Figures C and D are longitudinal cross-sectional views of the switch in the closed state, and Figure D is a plan view showing the relationship between the movable contacts and the fixed contacts as seen from the top surface of the conductive rubber. In the figure, reference numeral 2 denotes a substrate, and on the substrate 2, fixed contacts 13, 13 are provided at three points on a straight line at sufficient intervals, respectively, at both ends, and a fixed contact 14 is provided in the middle. Moreover, this sufficient spacing means a spacing that allows wiring patterns 20a, 20b, 20c, and 20d, which will be described later, to be formed between the respective fixed contacts 13, 14, and 14-13. A movable contact is disposed facing the fixed contacts 13, 13, 14, and the movable contact is made of conductive rubber 15, and both ends of the conductive rubber 15 are moved downward. Large protrusions 15a, 15b are provided, and the protrusions 15a, 15b are provided facing the fixed contacts 13, 13 provided at both ends of the straight line, and are always in contact with the fixed contacts 13, 13. At least it is electrically formed in a normally closed state. Further, a small protrusion 15c is provided at the middle part of the back surface of the conductive rubber 15. The small protruding portion 15c is formed shallower than the protruding portions 15a and 15b at both ends, faces the fixed contact 14 at the intermediate portion, and is electrically always open. Further, non-conductive rubbers 16, 16 are disposed in close contact with each other between the substrate and the conductive rubber 15 between the fixed contacts 13, 13, 14. Thus, the non-conductive rubber 16 can be formed integrally with the conductive rubber 15. Further, the non-conductive rubber 16 is connected to the fixed contact 1.
3, 14 and 14, 13, covering the wirings 20a, 20b, 20c, 20d arranged on the board 2,
The wirings 20a, 20b, 20c, and 20d are formed so as not to short-circuit with the respective fixed contacts 13, 13, and 14 and the conductive rubber 15. Moreover, these fixed contacts 13, 13, 14 and wiring 20a, 2
0b, 20c, and 20d are formed by etching copper plating. Further, in the figure, 7 is a frame that presses and supports the conductive rubber 15, 18 is a slider, 9 is a push button fixed to the slider 18, and 10 is interposed between the push button 9 and the frame 7 to control the push button 9. This is a coil spring that biases upward in the drawing. The push button switch 11 can be opened and closed in the same way as described above, by pressing the push button 9 of the push button switch 11 in the open state of FIG. 2A downward in the figure.
As shown in figure C, the slider 18 is made of conductive rubber 15.
Press and deform. At this time, the conductive rubber 1
The small protruding portion 15c in the middle part of the contact plate 5 contacts the fixed contact 14 in the middle part. Therefore, the fixed contacts 13 and 14, which are always in contact with the conductive rubber 15, are electrically connected to the intermediate fixed contact 14 through the conductive rubber 15, and are in a closed state. Next, when the pressing force on the push button 9 is released, the urging force of the coil spring 10 returns it to the open state as shown in FIG. 2A. The above-mentioned push button switch 11 is formed using a common board 2 and a frame 7, and is formed into a key matrix with a large number of keys. In the above configuration, the second
As shown in FIG. D, pattern wiring indicated by reference numerals 20a to 20d is provided between the fixed contacts 13, 13, and 14. At this time, as described above, the non-conductive rubber 16 is interposed between the wirings 20a to 20d and the conductive rubber 15, and has the role of preventing conduction between the wirings 20a to 20d and the conductive rubber 15. It also prevents the conductive rubber 15 from deforming downward and coming into contact with the fixed contact 14 in the open state, and further improves the feeling of pressing the slider 18 against the conductive rubber 15 when pressing the push button 9. be able to. Figure 3 A, B, and C are push button switches 21 of the present invention.
FIG. 2 is a cross-sectional view of the second embodiment of the present invention, and shows a cross-sectional view in an open state, a cross-sectional view immediately after the closed state, and a cross-sectional view in a state where the push button is further pressed after the closed state. Components that are the same as those in FIG. 2 are given the same reference numerals, and detailed explanations will be omitted. Second
What differs from the figure is the coil spring 22, which includes a small diameter portion 22a fitted into the slider 23 and a large diameter portion 22a supported by the conductive rubber 15.
2b are continuously formed in a lattice shape. Push button 9 of push button switch 21 in the open state in FIG. 3A
When the push button 9 is pressed, the conductive rubber 15, which is a movable contact, is deformed by the pressure of the coil spring 22, as shown in FIG. moves further downward. When the push button 9 is released, the state returns to the state shown in FIG. In this way, due to the presence of the coil spring 22, the push button switch 21
Even after the push button 9 is pressed and the small protrusion 15c provided on the conductive rubber 15 comes into contact with the fixed contact 14, the push button 9 has an extra slide stroke to prevent the occurrence of chattering and to improve the feeling of pressing the push button 9. It's increasing. Figure 4 A, B, and C are push button switches 31 of the present invention.
FIG. 7 is a cross-sectional view of the third embodiment of the present invention, and shows a cross-sectional view in an open state, a cross-sectional view immediately after the closed state, and a cross-sectional view in a state where the push button is further pressed after the closed state. Components that are the same as those in FIG. 2 are designated by the same reference numerals, and detailed description thereof will be omitted. In this embodiment, a hollow rubber 34 is provided below the slider 33, and the push button 9 is pressed in the same manner as in FIG.
Even after the small protrusion 15c of the conductive rubber 15 comes into contact with the fixed contact 14, the push button 9 has a pressing stroke as shown in FIG. This increases the effectiveness of things like doing things. Figure 5 A, B, and C are push button switches 41 of the present invention.
FIG. 4 shows a fourth embodiment of the present invention, and is a cross-sectional view in an open state, a cross-sectional view immediately after the closed state, and a cross-sectional view in a state where the push button is further pressed after the closed state. Components that are the same as those in FIG. 2 are designated by the same reference numerals, and detailed description thereof will be omitted. In this embodiment, arms 44a, 44 are attached to the hollow rubber 44.
b is integrally formed, one end of the arms 44a and 44b is placed against the upper surface of the conductive rubber 15, and the slider 43 is urged upward by the elastic force of the hollow rubber 44. With this configuration, it is possible to omit the coil spring 10 shown in FIG. 2, and when the push button 9 is pressed in the same manner as the hollow rubber 34 shown in FIG. is the fixed contact 14
Even after the push button 9 comes into contact with the push button 9, the push button 9 has a pressing stroke as shown in FIG. 6A and 6B show a fifth embodiment of the push button switch 51 of the present invention, showing a cross-sectional view in an open state and a perspective view of the conductive rubber (movable contact), respectively. Parts corresponding to those in FIG. 2 are given the same reference numerals. In this embodiment, protrusions 15 are provided on both sides of the upper part of the conductive rubber 15.
d. The protrusion 15d has the function of fixing the conductive rubber 15 to the frame 7 by press-fitting it into the frame 7, and reliably maintaining the gap between the small protrusion 15c and the fixed contact 14.

[Effect of the idea]

The present invention, as detailed in the above-mentioned embodiments,
Three fixed contacts are arranged in a straight line on the board at a sufficient distance apart, and the fixed contacts at both ends are protruding parts that protrude from the opposite ends of the conductive rubber. The fixed contact at the middle part is kept in electrically normally open state with respect to the small protrusion in the middle part of the conductive rubber that faces the push button. By operation, the left and right fixed contacts and the intermediate fixed contact can be opened and closed via the conductive rubber. At this time, since the fixed contacts are provided with a sufficient distance between them, it is possible to route the pattern wiring between them, and when a key matrix with multiple keys is formed, the fixed contacts at both ends are always connected. Since it is in the closed state, any fixed contact can be selected arbitrarily, and therefore wiring design on the board becomes extremely easy and productivity is improved. or,
Since the non-conductive rubber interposed between the conductive rubber and the substrate covers the wiring, it is natural that short circuits with the conductive rubber can be prevented.

[Brief explanation of drawings]

1A, B, and C are a cross-sectional view of a conventional push button switch in an open state, a cross-sectional view in a closed state, a plan view showing the relationship between the conductive rubber and a fixed contact as seen from above the conductive rubber, and FIG. Figure 2 and below are examples of the push button switch according to the present invention, and Figure 2 A, B,
C and D show a cross-sectional view of the first embodiment in an open state, a perspective view of the conductive rubber, a cross-sectional view of the closed state, and the relationship between the movable contact, the conductive rubber, and the fixed contact as seen from above the conductive rubber. Plan view, Figure 3 A, B, C
4A, B, and C are cross-sectional views of the second embodiment in the open state, immediately after the closed state, and with the push button further pressed after the closed state, and FIGS. 4A, B, and C are the open states of the third embodiment, respectively. , a sectional view immediately after the closed state, and a sectional view with the push button further pressed after the closed state, Fig. 5A,
B and C are a cross-sectional view of the fourth embodiment in the open state and a cross-sectional view immediately after the closed state, respectively. FIGS. 6A and B are a cross-sectional view of the fifth embodiment in the open state and a perspective view of the conductive rubber. . Explanation of codes, 1, 11, 21, 31, 41...
Push button switch, 2... Board, 3, 4, 13, 14
... Fixed contact, 15 ... Conductive rubber, 15a,
15b...Protrusion part, 15c...Small protrusion part, 16...
...Non-conductive rubber, 20a-20d...Wiring.

Claims (1)

[Scope of utility model registration request] A movable contact made of conductive rubber is provided opposite to a fixed contact provided on the board, and a non-conductive material is placed between the conductive rubber and the board to prevent short circuit between the conductive rubber and the fixed contact and wiring. In a push button switch with rubber interposed, three fixed contacts to be provided on the board are provided on a straight line at sufficient intervals, and further, the conductive rubber has both ends protruding significantly downward. A small protrusion is also provided in the center of the conductive rubber, and the protrusion is connected to the fixed contacts at both ends provided on the substrate, and a small protrusion is provided at the center of the conductive rubber. A non-conductive contact is formed at the center of the fixed contact so that it can be opened and closed by pushing a button, and wiring is provided between the fixed contacts at three points, and a non-conductive contact is inserted between the conductive rubber and the substrate. A push button switch that can be covered with rubber.